DABCOnium: An Efficient and High‐voltage Stable Singlet Oxygen Quencher for Metal‐O2 Cells

Yann Kevin Petit, Christian Leypold, Nika Mahne, Eleonore Siham Mourad, Lukas Schafzahl, Christian Slugovc, Sergey Borisov, Stefan Freunberger

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Singlet oxygen ( 1 O 2 ) causes a major fraction of the parasitic chemistry during the cycling of non-aqueous alkali metal-O 2 batteries and also contributes to interfacial reactivity of transition-metal oxide intercalation compounds. We introduce DABCOnium, the mono alkylated form of 1,4-diazabicyclo[2.2.2]octane (DABCO), as an efficient 1 O 2 quencher with an unusually high oxidative stability of ca. 4.2 V vs. Li/Li + . Previous quenchers are strongly Lewis basic amines with too low oxidative stability. DABCOnium is an ionic liquid, non-volatile, highly soluble in the electrolyte, stable against superoxide and peroxide, and compatible with lithium metal. The electrochemical stability covers the required range for metal–O 2 batteries and greatly reduces 1 O 2 related parasitic chemistry as demonstrated for the Li–O 2 cell.

Original languageEnglish
Pages (from-to)6535-6539
Number of pages5
JournalAngewandte Chemie / International Edition
Volume58
Issue number20
DOIs
Publication statusPublished - 13 May 2019

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Keywords

  • DABCOnium
  • electrochemistry
  • lithium batteries
  • quenchers
  • singlet oxygen

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis

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